What does “future support for MPEG4/H.264 video and AAC audio” mean exactly?
This future support will include the ability to natively playback standards-compliant H.264/AAC files in MP4 containers, including .f4v files, as well as m4v, mov, and 3gp. Content from other formats can also be transcoded into formats that are supported by Silverlight via Expression Encoder or a wide range of Windows Media compatible third-party encoding solutions. We are exploring support for other formats based on customer feedback and market need.